Summary

Cross-namespace Secret access vulnerability in DiscoveryServiceCertificate
allows users to bypass RBAC and access Secrets in unauthorized namespaces.

Affected Versions

All versions prior to v0.13.4

Patched Versions

v0.13.4 and later

Impact

Users with permission to create DiscoveryServiceCertificate resources in one
namespace can indirectly read Secrets from other namespaces, completely
bypassing Kubernetes RBAC security boundaries.

Workarounds

Restrict DiscoveryServiceCertificate create permissions to cluster administrators
only until patched version is deployed.

Credit

Thanks to @debuggerchen for the responsible disclosure.

• https://github.com/3scale-sre/marin3r/security/advisories/GHSA-gf93-xccm-5g6j
• https://github.com/3scale-sre/marin3r/pull/294
• https://github.com/3scale-sre/marin3r/commit/c60246a43ae8c0c38dd7267f298d68a121a159fa
• https://nvd.nist.gov/vuln/detail/CVE-2025-64171
• https://github.com/3scale-sre/marin3r/commit/859b14115fde1d67620e645cd1b62e90e30d9981
• https://github.com/advisories/GHSA-gf93-xccm-5g6j